计算:(1+12+14)×(12+14+16)-(1+12+14+16)×(12+14)=______
计算:(1+12+14)×(12+14+16)-(1+12+14+16)×(12+14)=______....
计算:(1+12+14)×(12+14+16)-(1+12+14+16)×(12+14)=______.
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(1+
+
)×(
+
+
)-(1+
+
+
)×(
+
)
=[48×(1+
+
)×(
+
+
)-48×(1+
+
+
)×(
+
)]÷48
=[4×(1+
+
)×12×(
+
+
)-12×(1+
+
+
)×4×(
+
)]÷48
=[(4+2+1)×(6+3+2)-(12+6+3+2)×(2+1)]÷48
=[77-69]÷48
=8÷48
=
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=[48×(1+
1 |
2 |
1 |
4 |
1 |
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1 |
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1 |
6 |
1 |
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1 |
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=[4×(1+
1 |
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1 |
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1 |
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1 |
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1 |
6 |
1 |
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1 |
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1 |
6 |
1 |
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1 |
4 |
=[(4+2+1)×(6+3+2)-(12+6+3+2)×(2+1)]÷48
=[77-69]÷48
=8÷48
=
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