25
S =S +S
=6×6+(6+4)×4÷2=56(cm²)
S =S +S
=6×6÷2+(6+4)×4÷2=38(cm²)
S =S -S =56-38=18(cm²)
S =S +S
=(10×10)+(8×8)=164(cm²)
S =S +S
=10×10÷2+(10+8)×8÷2=122(cm²)
S =S -S =164-122=42(cm²)
S =S +S
=4×4+3×3=25(cm²)
S =S +S
=(3+4)×4÷2+3×3÷2=18.5(cm²)
S =S -S =25-18.5=6.5(cm²)
S =S +S
=(8×8)+(5×5)=89(cm²)
S =S
=(8+5)×8÷2=52(cm²)
S =S -S =89-52=37(cm²)
-
S =S
=2×3÷2=3(cm²)
S =S
=6×(6-4)÷2
=6(cm²)
S =S -S
=(7+3)×5-(7+3)×3÷2
=35(cm²)
S =S -S
=(8.4+5.6)×4.5÷2-5.6×4.5÷2
=18.9(cm²)
S =S -S
=15×9-8×9÷2
=99(cm²)
S =S -S
=(10+10+10)×10÷2-10×10÷2
=100(m²)
-
S =S +S
=(12×12)+(6×6)=180(cm²)
S =S +S +S
=(6+12)×12÷2+(12-6)×12÷2+6×6÷2=162(cm²)
S =S -S =180-162=18(cm²)
S =S
=10×(10-5)÷2
=25(cm²)
S =S
=8×10÷2
=40(cm²)
S =S -S
=12×8-12×6÷2
=60(cm²)
S =S
=(10+5)×5÷2
=37.5(cm²)
S =S
=8×10÷2
=40(cm²)
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